Automatic shut-off valve



Dec. 10, 1929. A, B, CASE 1,739,207

AUTOMATIC SHUT OFF VALVE Filed June 7. 1928 fcn Patented Dec. l0, 1929 PATENT OFFICE ARTHUR B. CASE, 0F WILSON, OKLAHOIVIA AUTOMATIC SHUT-OFF VALVE Application led June 7, 1928. Serial No. 283,637.

The invention relates to means for cutting ofi' the motive medium to engines when an abnormal or excessive speed has been attained.

In accordance with this invention a normally closed valve interposed in the steam or fuel line, is provided with means for holding it open when the engine is running at or below a given speed, and which is adapted 10 to be tripped by the governor when the speed of theY engine exceeds that for which the clevice is set, thereby releasing the valve which automatically closes and cuts on the steam or fuel to the engine.

Vhile the drawing illustrates a preferred embodiment of the invention, it is to be understood that in adapting the means to meet specific needs and requirements, the design may be varied and such other changes in the minorl details of the invention as claimed, without departing from the spirit thereof.

For a full understanding of the invention and the merits thereof, reference is to be had to the following description and the drawing hereto attached, in which Figure 1 is a perspective view illustrative of an embodiment of the invention.

Figure 2 is a detail sectional view showing the position of the parts when the valve is open to admit steam or other fuel to the engine.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawing by like reference characters.

The numeral 1 denotes the steam or fuel line according to the type of engine equipped with the invention. The valve interposed in the line 1 is of the type normally closed and which is adapted to be held in open position against the closing means by devices elnbodying the invention. The'numeral 2 designates the body of the valve to which is fitted arbonnet 3 which is held in place by means of a union or nut 4. The stem 5 of the valve is slidably mounted in the bonnet 3. An open helical spring 6 mount-ed upon the inner end of the stem 5 normally exerts a pressure to hold the valve 7 seated.

A short rod` 8 is fitted to the projecting end of the stem 5 and projects laterally therefrom and is adapted to cooperate wit-h a pivoted member to hold the valve 7 in open position. The pivoted member comprises a stem 9 and a fork 10, the latter being pivoted to a nut 11 threaded upon the outer end of the bonnet 3. A cross bar 12 connects the elements of the'fork 10 and is adapted to engage the rod 8 to hold the valve unseated when the member is adjusted to occupy a position in line with the bonnet 3 and at a right angle to the line 1. An end portion of the rod 8 is threaded into the stem 5 and receives a jamb nut 8a which secures it in the required adjusted position. The opposite end of the rod 8 is flattened to enable a firm grip thereon when rotating the rod in the adjustment thereof. A rod 13 is adjustably connected with the pivoted member and passes through an opening formed in the stem 9 and is made secure in the adjusted position by means of a set screw 14.

rlhe numeral 15 designates a governor mechanism suoli as usually provided for controlling the steam of an engine according to the load. This governor mechanism may be of any type or make and includes a movable part 16 which is actuated by the weighted arms. In accordance with the present invention the parts are so disposed and adjusted that an end of the rod 13 projects into the path of the movable part 16 of the governor to be tripped thereby when the speed of the engine becomes abnormally increased.

IVhen the invention is adapted for use in connection with an internal combustion engine the valve 2 is located in the length of the fuel pipe and when applied to a steam engine the valve is located in the length of the steam pipe. In either case the valve is held open when the pivoted member is adjusted to occupy a position in line with the bonnet 3, the stem 5 being drawn outwardly and the element 8 engaged over the cross bar 12. When thus adjusted an end of the rod 13 is disposed in the path of the part 16 and, when the speed of the engine is accelerated beyond the normal, part 16 engages the rod 13 and moves it and the pivoted member to disengage the cross bar 12 from the element 8 with the result being that the spring 6 being released expands and effects a seating of the valve 7 to out off steam 0r fuel to the engine thereby preventing a continuous operation of the engine at a dangerous or excessive speed.

Having thus described the invention, I claim:

In 'an engine cut off thecombinaition With a spring actuated valve, an element projecting laterally 'from the valve stem, a member pivoted to the valve body and comprising a stem and a fork, a cross bar connecting the elements of the fork and adapted to engage the lateral element of the valve stem, .and a rod adjustably connected with the stem of .the Vpivoted member and .,adafpted to fbe tripped to release the valve Vand admit `of its automatic seating.

In testimony Whereofl alix my signature.

ARTHUR B. .GAS-,n {Le} 

